AD	Alzheimer’s Disease
AIDS	Acquired Immunodeficiency Syndrome
ART	Antiretroviral therapy
CE	Capillary Electrophoresis
CE-MS	Capillary Electrophoresis–Mass Spectrometry
CID	Collision-Induced Dissociation
DKD	Diabetic Kidney Disease
DR	Diabetic Retinopathy
EI	Electron Ionization
ESI	Electrospray Ionization
ESI-MS	Electrospray Ionization Mass Spectrometry
ESI-MS/MS	Electrospray Ionization Tandem Mass Spectrometry
ESI-QTOF	Electrospray Ionization Quadrupole Time-of-Flight Mass Spectrometry
GC	Gas Chromatography
GC×GC	Comprehensive Two-dimensional Gas Chromatography
GC-MS	Gas Chromatography–Mass Spectrometry
GC-MS/MS	Gas Chromatography–Tandem Mass Spectrometry
GDM	Gestational Diabetes Mellitus
HCV	Hepatitis C Virus
HDL	High-Density Lipoprotein
HF	Heart Failure
HIV	Human Immunodeficiency Virus
HPLC	High-Performance Liquid Chromatography
HPLC-MS	High-Performance Liquid Chromatography–Mass Spectrometry
HPLC-MS/MS	High-Performance Liquid Chromatography–Tandem Mass Spectrometry
ICU	Intense Care Unit
LC	Liquid Chromatography
LC-MS	Liquid Chromatography–Mass Spectrometry
LC-MS/MS	Liquid Chromatography–Tandem Mass Spectrometry
LDL	Low-Density Lipoprotein
LN	Lupus Nephritis
LPC	Lysophosphatidylcholine
m/z	Mass-to-Charge Ratio
MRM	Multiple Reaction Monitoring
MRM-MS	Multiple Reaction Monitoring Mass Spectrometry
MS	Mass Spectrometry
MS/MS	Tandem Mass Spectrometry
NAFL	Nonalcoholic Fatty Liver
NAFLD	Non-alcoholic Fatty Liver Disease
NASH	Nonalcoholic steatohepatitis
PC	Phosphatidylcholine
PCOS	Polycystic Ovary Syndrome
PCT	Procalcitonin
PDR	Proliferative Diabetic Retinopathy
QQQ	Triple Quadrupole
QTOF	Quadrupole Time-of-Flight
RA	Rheumatoid Arthritis
RYGB	Roux-en-Y Gastric Bypass
SLE	Systemic Lupus Erythematosus
SM	Sphingomyelin
SRM	Selected Reaction Monitoring
T1D	Type 1 Diabetes
T2D	Type 2 Diabetes
TCA	Tricarboxylic Acid
TNF-$\alpha$	Tumour Necrosis Factor alpha
TOF	Time-of-Flight
TOF-MS	Time-of-Flight Mass Spectrometry
UHPLC	Ultra-High-Performance Liquid Chromatography
UHPLC-MS/MS	Ultra-High Performance Liquid Chromatography–Tandem Mass Spectrometry
UPLC	Ultra Performance Liquid Chromatography
UPLC-Q-TOF-MS	Ultra-Performance Liquid Chromatography Quadrupole Time-of-Flight Mass Spectrometry
WHO	World Health Organization